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Three-phase/two-phase rotary transformer

a transformer and rotary technology, applied in the field of transformers, can solve the problems of limited weight and volume of transformers, and achieve the effect of limiting the volume and weight of transformers

Active Publication Date: 2015-05-07
SAFRAN ELECTRICAL & POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text suggests that using a three-phase portion in the transformer topology can help reduce the size and weight of the transformer. Additionally, the use of toroidal coils in the transformer design eliminates the need for more complex coil shapes. Overall, this design enables a more efficient and compact transformer.

Problems solved by technology

This transformer presents limited weight and volume.

Method used

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  • Three-phase/two-phase rotary transformer
  • Three-phase/two-phase rotary transformer
  • Three-phase/two-phase rotary transformer

Examples

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first embodiment

[0028]FIG. 1 is a section view of a rotary transformer 10 in the invention. The transformer 10 is a magnetically shielded three-phase / two-phase rotary transformer with forced linked fluxes.

[0029]The transformer 10 comprises a three-phase portion 11 and a two-phase portion 12 that are suitable for rotating relative to each other about an axis A. By way of example portion 11 is a stator and the portion 12 is a rotor, or vice versa. In a variant, the portion 11 and the portion 12 are both movable in rotation relative to a stationary frame of reference (not shown).

[0030]The portion 12 comprises a ring 13 of axis A and three legs 14, 15, and 16 made of the ferromagnetic material. Each of the legs 14, 15, and 16 extends radially away from the axis A, starting from the ring 13. The leg 14 is at one end of the ring 13, the leg 16 is at another end of the ring 13, and the leg 15 lies between the legs 14 and 16. The ring 13 and the legs 14 and 15 define an annular slot 34 that is open in a ra...

second embodiment

[0071]FIG. 5 shows a transformer 110 in the invention. The transformer 110 may be considered as being an “E-shaped” or a “pot-shaped” variant of the “U-shaped” transformer 10 of FIG. 1. The same references are therefore used as in FIG. 5 and in FIG. 1, without risk of confusion, and a detailed description of the transformer 110 is omitted. It is merely mentioned that, as can be seen in FIG. 6, which is an exploded perspective view of the magnetic circuit of the transformer 110, the references 13 and 17 correspond to two axially spaced-apart rings, the legs 14 to 16 and 18 to 20 extending axially between the two rings 13 and 17, and that the magnetic cores in this example are situated in the columns.

[0072]In known manner in the field of transformers, a transformer may have a plurality of secondaries. Thus, in an embodiment not shown, a transformer comprises a three-phase portion at its primary, and at its secondary a portion that presents the same magnetic structure as the portion 12...

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Abstract

A three-phase / two-phase rotary transformer including a three-phase portion and a two-phase portion that are movable in rotation relative to each other about an axis A. The three-phase portion includes a first body made of ferromagnetic material and three-phase coils, the two-phase portion including a second body made of ferromagnetic material and two-phase coils. The second body defines a first annular slot of axis A and a second annular slot of axis A, the two-phase coils including a first toroidal coil of axis A in the first slot, a second toroidal coil of axis A in the first slot, a third toroidal coil of axis A in the second slot, and a fourth toroidal coil of axis A in the second slot, the first coil and the fourth coil being connected in series, the second coil and the third coil being connected in series.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to the general field of transformers. In particular, the invention relates to a three-phase / two-phase transformer.[0002]In certain situations, it may be necessary to transfer energy in balanced manner from a three-phase source to a two-phase source. There already exist three-phase / two-phase static transformers, in particular one known as a Scott connection and the other known as a Leblanc connection circuit. Nevertheless, a three-phase / two-phase rotary transformer does not exist.[0003]To perform this function, one solution consists in using a three-phase / two-phase static transformer and two single-phase rotary transformers. Another solution consists in using three single-phase rotary transformers using the Leblanc connection.[0004]Nevertheless, both of those solutions require large weights and volumes. Furthermore, in the first solution, there are problems of residual magnetization and of current surges when switching on...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02M5/14H01F30/14H01F38/18
CPCH02M5/14H01F30/14H01F38/18
Inventor DUVAL, CEDRIC
Owner SAFRAN ELECTRICAL & POWER